. >> reporter: gun shows like this one in daly city, california, are packed with record crowds one month after the shooting at an elementary schools in newtown, connecticut. >> it looks like the current political climate created an artificial demand. >> reporter: gun dealers in the country say they have seen a dramatic increase in sales as lawmakers consider a federal ban on assault weapons. >> we believe that gun violence is a public health crisis. >> reporter: hundreds rallied in seattle yesterday in support of gun control. >> i think that there are more rational reasonable people who understand the difference between assault weapons and, you know, other types of guns that you might have for hunting purposes. >> reporter: vice president joe biden will give president obama his recommendations for curbing gun violence tomorrow. they could include restrictions on assault weapons and high capacity magazines as well as background checks on all gun buyers. the head of the national rifle association says he believes there's not enough support in congress to ban assault weapons. >> i would say